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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14441) LoadBalancingKMSClientProvider#addDelegationTokens should add delegation tokens from all KMS instances
Date Mon, 22 May 2017 17:07:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019837#comment-16019837
] 

Arun Suresh commented on HADOOP-14441:
--------------------------------------

I agree with [~shahrs87]. If the KMS is configured to use the ZK delegationtoken secret manager,
you would not to add the DTs from all KMS instances.
Since a DT issued by 1 KMS instance will be validated by any of its peers.

> LoadBalancingKMSClientProvider#addDelegationTokens should add delegation tokens from
all KMS instances
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14441
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14441
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: kms
>    Affects Versions: 2.7.0
>         Environment: CDH5.7.4, Kerberized, SSL, KMS-HA, at rest encryption
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>         Attachments: HADOOP-14441.001.patch, HADOOP-14441.002.patch, HADOOP-14441.003.patch
>
>
> LoadBalancingKMSClientProvider only gets delegation token from one KMS instance, in a
round-robin fashion. This is arguably a bug, as JavaDoc for {{KeyProviderDelegationTokenExtension#addDelegationTokens}}
states:
> {quote}
> /**
>      * The implementer of this class will take a renewer and add all
>      * delegation tokens associated with the renewer to the 
>      * <code>Credentials</code> object if it is not already present, 
> ...
> **/
> {quote}
> This bug doesn't pop up very often, because HDFS clients such as MapReduce unintentionally
calls {{FileSystem#addDelegationTokens}} multiple times.
> We have a custom client that accesses HDFS/KMS-HA using delegation token, and we were
puzzled why it always throws "Failed to find any Kerberos tgt" exceptions talking to one KMS
but not the other. Turns out that client couldn't talk to the KMS because {{FileSystem#addDelegationTokens}}
only gets one KMS delegation token at a time.



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